Paper-making machine.



No. 715,749. Patented nee. l6, I902.

c. .1. BRADBURY. 1

PAP ER MAKING MACHINE.

(Appficmtion filed June 9, 19023,

(No Modal.)

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4 .Iv-ov evzzfo r W awake firacz wg UNITED STATES PATENT OFFICE.

CHARLES J. BRADBURY, OF BOSTON, MASSACHUSETTS, ASSIGNOR OF ONE- HALF TO. J. H. HORNE & SONS COMPANY, OF LAWRENCE, MASSACHU- SETTS, A CORPORATION OF MASSACHUSETTS.

PAPER-MAKING MACHINE.

SPECIFICATION forming part of Letters Patent No. 715,749, dated December 16, 1902.

I Application filed June 9,1902. Serial No. 110,715. (No model.)

To all whom, it may concern:

Be it known that I, CHARLES J. BRADBURY, a citizen of the United States, residing at Boston, in the county of Suffolk and State of Massachusetts, have invented an Improvement in Paper-Making Machines, of which the following description, in connection with the accompanying drawings, is a specification, like numerals on the drawings represent- IO ing like parts.

This invention relates to that part of papermaking machine commonly known as the Fourdrinier, and especially to the construction of the table-rolls which support the making-wire. In these Fourdrinier machines, especially in machines in which the paper travels rapidly, it has been found difficult to remove the water from the making-wire with sufficient rapidity without the use of extra suction-boxes, which are in a degree detrimental to the quality of the sheet of paper being produced. One of the reasons for this inability to remove the water is that much of the water which drains through the wire adheres to the surface of the table-rolls and being carried around by the rolls accumulates between the upper surface of each roll and the making-wire. The water which thus accumulates between the making-Wire and the table-rolls is partially reabsorbed by the paper, thus adding more moisture thereto and requiring either extra length of wire or extra suction-boxes for its removal. It thus happens with the ordinary construction of table- 3 5 rolls that water which has once been drained from the paper upon the making-wire is carried around by the surface of the rolls only to be reabsorbed by the paper again.

It is the object of my invention to provide a novel form of table-roll which will operate most efiiciently to prevent the accumulation of water which has once been drained from the making-wire between the making-wire and the roll, whereby a less length of wire is necessary and a better grade of paper produced.

The form of table-roll which I preferably employ is one having transverse openings or passages extending therethrough through between the making wire and the roll is drained by gravity and deposited directly into the save-all box.

In the drawings, Figure 1 shows a part of a Fourdrinier machine, partly in side eleva tion and partly in section. Fig. 2 illustrates the operation of the ordinary type of tableroll. Fig. 3 illustrates the action of my improved table-roll in draining the water from the making-wire. Fig. 4 is a View of a portion of a table-roll, showing one embodiment of my invention; and Fig. 5 is a View showing a slightly-difierent form of my invention.

The Fourdrinier machine, part of which is shown in Fig. 1, may be of any familiar type, as my invention is applicable to any Fourdrinier machine, and as the operation and function of such machines are familiar to those skilled in the art it will be unnecessary to herein describe the machine in detail.

The making-wire 3, of any usual construction, passes, as usual, over the breast-roll 4 and then over the table-rolls 5, upon which said wire is supported. As usually constructed the table-rolls have a solid surface, they usually being made tubular, as seen in Fig. 2, and having heads at their ends, to which the journals 60 are secured. Where the surface of the roll is thus solid or continuous, a considerable portion of the water So which drains through the wire or is forced through the wire by the contact of the same with the roll adheres to the roll and by rotary movement of the roll accumulates between the roll and the wire. For instance, assuming that the wire is. moving in the direction of the arrow, Fig. 2, in which figure is represented the ordinary table-rolls having a continuous surface, the water which has drained through the wire and adheres to the roll 5 is carried thereby to substantially the point of contact between the roll and wire and accumulates at this point, as shown at 6, Fig. 2. A part of this accumulated water which has once been drained from the wire is reabsorbed again by the paper on the wire, thus putting extra work upon the succeeding rolls. My invention contemplates aconstruction of roll which will allow the water which accumulates at 6 to drain away from the wire by [00 gravity, and for this purpose the roll is provided with one or more drain passages, through which the said accumulated water is drained into the usual save-all box 9. In the preferred embodiment of my invention these drain-passages are provided by perforating the shell of the roll. The perforations may be made in any way so long as they perform the function intended, and in Fig. i I have shown the roll as provided with a series of slots 7, extending longitudinally of the roll, the slots being separated at intervals, as at S. In the form of the invention shown in Figs. 3 and 4: I provide four series of slots, each series comprising a line of slots extending longitudinally of the roll, and the slots of one series are so placed with reference to the slots of the adjacent series that the spaces 8 between the slots of each series are out of line circumferentially with the spaces between the slots of the adjacent series. The result of this construction is that any circumferential line on the roll will at some point intersect one of the slots, so that as the wire passes over the roll every point on the wire will pass over an open space or perforation in the roll.

The operation of my improved device is plainly indicated in Fig. 3, from which it will be seen that assuming the wire to be moving in the direction of the arrow any water which tends to accumulate between the roll and the wire at the point 6 will drain by gravity through the apertures 7 into the interior of the roll and from the interior of the roll will drain through the apertures at the lower portion of the roll directly into the usual saveall box 9.

While it will be within the scope of my invention to provide only asingle row of perforations,yet I prefer to construct the roll substantially as shown in Figs. 3 and 4. If desired, however, the number of perforations may be increased or decreased without in any way departing from the spirit of my invention. In Fig. 5 the perforations 7 are shown as smaller than in Fig. 4 and in the form of cylindrical apertures, the apertures having a staggered arrangement, as shown, so that every point on the making-wire will at some time in its course pass over a perforation.

Vith my improved roll it is impossible for any water to accumulate at the point 6, and hence all the water which has once been drained from the wire will be conducted to the save-all box, and none of the water thus drained will be carried back into contact with the wire to be reabsorbed by the paper thereon.- The effect of the construction illustrated is the same as if the table-rolls were provided with a plurality of transverse passages through which the water is drained from the making-wire solely by gravity. While I have herein shown one way in which these drainpassages may be constructed, my invention is not limited to the exact construction shown, for, believing that I am the first to employ a table-roll having drain-passages, whereby the water which tends to accumulate between the roll and the making-wire may drain by gravity through the said passages into the saveall box, I desire to claim the same broadly and would consider as coming within my invention any table-roll provided with one or more drain passages of any description, whether extending through or circumferentially of the roll,through which the water from the making-wire may drain by gravity as the wire passes thereover. I also desire to state that my invention contemplates the use of the drain-passages on all or any number of the rolls in a Fourdrinier machine, as circumstances may dictate, and I would consider as coming within my invention a Fourdrinier machine in which one only or any number of the table-rolls were provided with the drainpassages.

Having described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. A Fourdrinier paper-machine having rotatable perforated table-rolls.

2. A Fourdrinier paper-machine having rotatable table-rolls provided with passages extending transversely through the same.

3. A paper-machine provided with rotatable table-rolls adapted to support a making-wire, and means to conduct the water which tends to accumulate on the front of each roll through said roll into the save-all box.

4. A paper-machine provided with rotatable table-rolls adapted to support the wire, and means whereby the water which tends to accumulate between each roll and the wire is drained solely by gravity through the roll into the save-all box.

5. A table-roll for a paper-machine having transverse passages extending entirely through the roll.

6. A table-roll for a paper-machine having passages extending transversely therethrough and in diiferent angular positions.

7. A table-roll for a paper-machine presenting a perforated cylindrical shell, the perforations being distributed over the surface of the shell.

8. A table-roll for a paper-machine presenting a perforated cylindrical shell, the perforations being so placed that any circumferential line on the roll will intersect at least one of said perforations.

9. In a Fourdrinier paper-machine, a making-wire and a plurality of table-rolls supporting the same, said rolls each having a plurality of transverse passages extending therethrough and so situated that every point on the makingwire will pass over at least one of the openings in some one of the rolls.

10. In aFourdrinierpaper-machine, amaking-wire, and a plurality of tubular table-rolls supporting the same, each of said rolls having a plurality of perforations in its shell, the perforations being so arranged that every point of the making-wire will pass over at least one of said perforations in some one of the rolls.

11. A table-roll for a paper-machine having a drain-passage through which the water which tends to accumulate between the wire and the roll drains solely by gravity.

12. In a Fourdrinier paper-machine, a making-wire, and a plurality of rotatable tablerolls supporting the same, each roll having one or more drain-passages therein, through which the water which tends to accu in ulate between the roll and wire may drain by gravity, said drain-passages being in operative position at any position of the rolls.

13. In a Fourdrinier paper-machine, a making-wire and a plurality of rotatable tablerolls, one of said rolls having a drain-passage 

